Thermal properties of new biocomposites prepared from modified starch
matrix reinforced with natural vegetable fibres were studied. DSC and TG methods
were applied to study thermal behaviour of biocomposites. Biocomposites were
obtained in the laboratory twin-screw extruder. Two kinds of natural fibres
were used, i.e. flax and cellulose in the amount of 0–40 mass%. DSC
curves of biocomposites reveal glass transition temperature, attributed to
the amorphous nature of the plasticized starch matrix. In general, incorporating
natural fibres into modified starch matrix leads to an increase in glass transition
Thermal degradation of modified starch matrix and
cellulose reinforced biocomposites proceeds in three steps, whereas the degradation
process of flax reinforced biocomposites occurs in two steps. For unreinforced
matrix as well as for all biocomposites, regardless of type and amount of
reinforcement, the major mass loss is observed at the temperature above 300C.
The increase in thermal stability with introduction of natural fibre is observed
for both flax and cellulose reinforced biocomposites.